CVE-2026-56855

Prevent DoS on deadlocked established channel in golang.org/x/crypto/ssh

CVE-2026-56855 is fixed in 32 products on 1 platform, first by DEBIAN-CVE-2026-56855, released September 8, 2026. It is not reported as exploited. Patch Radar priority: High.

High
CVSS
7.5
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0050
43rd percentile

The buildah package provides a tool for facilitating building OCI container images. Among other things, buildah enables you to: Create a working container, either from scratch or using an image as a starting point; Create an image, either from a working container or using the instructions in a Dockerfile; Build both Docker and OCI images. Security Fix(es): * podman: Arbitrary file write when importing OCI archive (CVE-2025-11395) * golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via crafted messages (CVE-2026-56855) * net/[http:](http:) golang: golang: Denial of Service via crafted HTTP Range headers (CVE-2026-78667) * crypto/x509: golang: crypto/x509: Man-in-the-middle attacks via untrusted intermediate certificates (CVE-2026-111943) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Where it's fixed

ProductFixed inFixReleased
Linux
alloy · opensuse-leap 16.0 1.19.2-160000.1.1 OPENSUSE-SU-2026:22032-1 Oct 6, 2026
alloy · sles 15.7 1.19.2-150700.15.29.1 SUSE-SU-2026:4408-1 Oct 1, 2026
alloy · sles 16.0 1.19.2-160000.1.1 SUSE-SU-2026:24148-1 Oct 6, 2026
amazon-ssm-agent · amzn 2023 3.3.5390.0-1.amzn2023 ALAS2023-2026-3160 Nov 7, 2026
amazon-ssm-agent · opensuse-leap 16.0 3.3.5390.0-160000.1.1 OPENSUSE-SU-2026:21884-1 Sep 20, 2026
amazon-ssm-agent · sles 15.6 3.3.5390.0-150000.5.43.1 SUSE-SU-2026:4372-1 Sep 28, 2026
amazon-ssm-agent · sles 15.7 3.3.5390.0-150000.5.43.1 SUSE-SU-2026:4372-1 Sep 28, 2026
apptainer · opensuse-leap 16.0 1.5.3-bp160.4.1 OPENSUSE-SU-2026:21927-1 Sep 21, 2026
apptainer · sles 15.7 1.5.3-150600.4.43.1 SUSE-SU-2026:4308-1 Sep 23, 2026
buildah · RHEL 9 2:1.43.4-2.el9_8 RHSA-2026:90424 Sep 24, 2026
buildah · almalinux 9 2:1.43.4-2.el9_8 ALSA-2026:90424 Nov 7, 2026
buildah · ol 9 2:1.43.3-2.0.1.el9_8 ELSA-2026-70640 Sep 24, 2026
buildah · rocky 9 2:1.43.4-2.el9_8 RLSA-2026:90424 Nov 7, 2026
buildah-tests · RHEL 9 2:1.43.4-2.el9_8 RHSA-2026:90424 Sep 24, 2026
buildah-tests · almalinux 9 2:1.43.4-2.el9_8 ALSA-2026:90424 Nov 7, 2026
buildah-tests · ol 9 2:1.43.3-2.0.1.el9_8 ELSA-2026-70640 Sep 24, 2026
cloudflared · opensuse-leap 16.0 2026.9.1-bp160.1.1 OPENSUSE-SU-2026:21924-1 Sep 21, 2026
containerd · amzn 2023 2.3.7-1.amzn2023.0.1 ALAS2023-2026-3273 Nov 7, 2026
containerd-debuginfo · amzn 2023 2.3.7-1.amzn2023.0.1 ALAS2023-2026-3273 Nov 7, 2026
containerd-debugsource · amzn 2023 2.3.7-1.amzn2023.0.1 ALAS2023-2026-3273 Nov 7, 2026
containerd-stress · amzn 2023 2.3.7-1.amzn2023.0.1 ALAS2023-2026-3273 Nov 7, 2026
containerd-stress-debuginfo · amzn 2023 2.3.7-1.amzn2023.0.1 ALAS2023-2026-3273 Nov 7, 2026
containerized-data-importer · sles 15.7 1.64.0-150700.9.14.1 SUSE-SU-2026:4209-1 Sep 16, 2026
containerized-data-importer1.65 · opensuse-leap 16.0 1.65.0-160000.3.1 OPENSUSE-SU-2026:21824-1 Sep 9, 2026
cosign · opensuse-leap 16.0 3.1.3-160000.1.1 OPENSUSE-SU-2026:22064-1 Nov 7, 2026
cosign · sles 15.6 3.1.3-150400.3.57.1 SUSE-SU-2026:4392-1 Sep 29, 2026
cosign · sles 15.7 3.1.3-150400.3.57.1 SUSE-SU-2026:4392-1 Sep 29, 2026
cosign · sles 16.0 3.1.3-160000.1.1 SUSE-SU-2026:24213-1 Nov 7, 2026
gh · opensuse-leap 16.0 2.100.0-bp160.1.1 OPENSUSE-SU-2026:21861-1 Sep 15, 2026
golang-go.crypto · Debian 14 1:0.56.0-1 DEBIAN-CVE-2026-56855 Sep 8, 2026
google-guest-agent · opensuse-leap 16.0 20260903.01-160000.1.1 OPENSUSE-SU-2026:21879-1 Sep 18, 2026
google-guest-agent · sles 15.6 20260903.01-150000.1.85.1 SUSE-SU-2026:4270-1 Sep 21, 2026
google-guest-agent · sles 15.7 20260903.01-150000.1.85.1 SUSE-SU-2026:4270-1 Sep 21, 2026
google-osconfig-agent · opensuse-leap 16.0 20260911.00-160000.1.1 OPENSUSE-SU-2026:21882-1 Sep 19, 2026
google-osconfig-agent · sles 15.6 20260911.00-150000.1.67.1 SUSE-SU-2026:4293-1 Sep 23, 2026
google-osconfig-agent · sles 15.7 20260911.00-150000.1.67.1 SUSE-SU-2026:4293-1 Sep 23, 2026
govulncheck-vulndb · opensuse-leap 16.0 0.0.20260902T191204-160000.1.1 OPENSUSE-SU-2026:21812-1 Sep 8, 2026
govulncheck-vulndb · sles 16.0 0.0.20260902T191204-160000.1.1 SUSE-SU-2026:23712-1 Sep 8, 2026
hauler · opensuse-leap 16.0 2.1.0-bp160.3.1 OPENSUSE-SU-2026:21841-1 Sep 14, 2026
hcloud · Fedora 43 1.69.0-1.fc43 FEDORA-2026-6D4A64A6B0 Sep 30, 2026
hcloud-debuginfo · Fedora 43 1.69.0-1.fc43 FEDORA-2026-6D4A64A6B0 Sep 30, 2026
hcloud-debugsource · Fedora 43 1.69.0-1.fc43 FEDORA-2026-6D4A64A6B0 Sep 30, 2026
helm · opensuse-leap 16.0 4.3.0-160000.1.1 OPENSUSE-SU-2026:21983-1 Sep 30, 2026
helm · sles 16.0 4.3.0-160000.1.1 SUSE-SU-2026:23984-1 Sep 30, 2026
keybase-client · opensuse-leap 16.0 6.6.3-bp160.3.1 OPENSUSE-SU-2026:21846-1 Sep 14, 2026
nerdctl · amzn 2023 2.3.5-1.amzn2023.0.2 ALAS2023-2026-3274 Nov 7, 2026
rclone · amzn 2023 1.75.1-1.amzn2023 ALAS2023-2026-3129 Sep 28, 2026
rclone · opensuse-leap 16.0 1.75.1-bp160.1.1 OPENSUSE-SU-2026:21999-1 Sep 28, 2026
rclone-debuginfo · amzn 2023 1.75.1-1.amzn2023 ALAS2023-2026-3129 Sep 28, 2026
rclone-debugsource · amzn 2023 1.75.1-1.amzn2023 ALAS2023-2026-3129 Sep 28, 2026
runfinch-finch · amzn 2023 1.19.0-1.amzn2023.0.1 ALAS2023-2026-3140 Sep 28, 2026
trivy · opensuse-leap 16.0 0.74.0-160000.3.1 OPENSUSE-SU-2026:21835-1 Sep 14, 2026
zk · opensuse-leap 16.0 0.15.6-bp160.2.1 OPENSUSE-SU-2026:21814-1 Sep 8, 2026

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